TGF-beta I gene polymorphism in heart transplant recipients--effect on renal function

Area of Science:

• Cardiology
• Nephrology
• Genetics

Background:

• Renal dysfunction is a serious complication following heart transplantation (HTx).
• Transforming growth factor beta I (TGF-βI) is a cytokine implicated in fibrosis.
• TGF-βI gene polymorphism may influence cytokine production and disease outcomes.

Purpose of the Study:

• To investigate TGF-βI gene polymorphism as a predictor of renal insufficiency after HTx.
• To evaluate the association between TGF-βI genotypes and the progression of renal function in HTx recipients.

Main Methods:

• Genotyping for TGF-βI signal peptide polymorphisms (codon 10 and 25) using PCR in 175 HTx patients and 268 controls.
• Monitoring of renal function post-HTx.
• Comparison of renal function progression based on TGF-βI genotypes.

Main Results:

• No significant differences in TGF-βI allele/genotype frequencies between healthy controls and HTx recipients.
• Renal function declined over time in most HTx recipients.
• Worse progression of renal insufficiency (RI) was observed in patients with Leu at codon 10 (LeuLeu vs. LeuPro/ProPro, p < 0.01) and homozygous Arg at codon 25 (ArgArg vs. ArgPro, p < 0.01).
• In LeuPro heterozygotes at codon 10, codon 25 genotype influenced RI progression (LeuPro/ArgArg vs. LeuPro/ArgPro, p < 0.05).

Conclusions:

• TGF-βI gene polymorphism has prognostic significance for renal insufficiency in heart transplant recipients.
• Specific TGF-βI genotypes are associated with accelerated renal function decline post-HTx.